Dynamic retrieval of nsac information

Abstract

Systems and methods are disclosed for dynamic retrieval of Network Slice Admission Control (NSAC) information in a Visited Public Land Mobile Network (VPLMN) of a User Equipment (UE). In one embodiment, a method performed by a network node in a VPLMN of a UE comprises receiving, from the UE, a request comprising information indicating a particular network slice that is subject to NSAC. The method further comprises obtaining subscription data that comprises information that indicates whether VPLMN or Home Public Land Mobile Network (HPLMN) control should be applied for NSAC and sending an update request to a Network Slice Admission Control Function (NSACF) in the VPLMN of the UE, wherein the update request comprises the information that indicates whether VPLMN or HPLMN control should be applied for NSAC.

1 . A method performed by a network node in a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE, the method comprising:
 receiving, from the UE, a request comprising information indicating a particular network slice that is subject to Network Slice Admission Control, NSAC;   obtaining subscription data that comprises information that indicates whether VPLMN or Home Public Land Mobile Network, HPLMN, control should be applied for NSAC; and   sending an update request to a Network Slice Admission Control Function, NSACF, in the VPLMN of the UE, wherein the update request comprises the information that indicates whether VPLMN or HPLMN control should be applied for NSAC.   
     
     
         2 . A network node for a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE, the network node comprising processing circuitry configured to cause the network node to:
 receive, from the UE, a request comprising information indicating a particular network slice that is subject to Network Slice Admission Control, NSAC;   obtain subscription data that comprises information that indicates whether VPLMN or Home Public Land Mobile Network, HPLMN, control should be applied for NSAC; and   send an update request to a Network Slice Admission Control Function, NSACF, in the VPLMN of the UE, wherein the update request comprises the information that indicates whether VPLMN or HPLMN control should be applied for NSAC.   
     
     
         3 . A method performed by a Network Slice Admission Control Function, NSACF, in a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE, the method comprising:
 receiving, from a network node in the VPLMN of the UE, an update request, the update request being a request to update a number of registered UEs or a number of Protocol Data Unit, PDU, sessions for a Home Public Land Mobile Network, HPLMN, mapped network slice;   obtaining subscription data indicating whether VPLMN or HPLMN control should be applied for Network Slice Admission Control, NSAC;   obtaining, from the HPLMN, information that indicates a maximum number of registered UEs or PDU session for the HPLMN mapped network slice; and   applying the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice when processing the update request.   
     
     
         4 . The method of  claim 3 , wherein obtaining the subscription data indicating whether VPLMN or HPLMN control should be applied for NSAC comprises obtaining the subscription data from any one of:
 a. the network node in the VPLMN of the UE;   b. a User Data Management in the HPLMN of the UE; or   c. a network node in the HPLMN of the UE.   
     
     
         5 . The method of  claim 3  further comprising subscribing at the HPLMN to any changes to the information that indicates the maximum number of registered UEs or PDU session for the HPLMN mapped network slice. 
     
     
         6 . The method according to  claim 3  further comprising, for any subsequent update requests to add a UE entry exceeding the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice, obtaining admission control from the HPLMN indicating if the request should be granted or not and upon determining the request is granted storing the UE entry. 
     
     
         7 . The method according to  claim 3  further comprising, for any subsequent update requests to add a UE entry exceeding the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice, rejecting the update request. 
     
     
         8 . A network node that implements a Network Slice Admission Control Function, NSACF, for a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE, the network node comprising processing circuitry configured to cause the network node to:
 receive, from a network node in the VPLMN of the UE, an update request, the update request being a request to update a number of registered UEs or a number of Protocol Data Unit, PDU, sessions for a Home Public Land Mobile Network, HPLMN, mapped network slice;   obtain subscription data indicating whether VPLMN or HPLMN control should be applied for Network Slice Admission Control, NSAC;   obtain, from the HPLMN, information that indicates a maximum number of registered UEs or PDU session for the HPLMN mapped network slice; and   apply the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice when processing the update request.   
     
     
         9 . (canceled) 
     
     
         10 . A method comprising:
 at a network node in a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE:
 receiving, from the UE, a request comprising information that indicates a particular network slice that is subject to Network Slice Admission Control, NSAC; 
 sending an update request to a Network Slice Admission Control Function, NSACF, in the VPLMN of the UE, wherein the update request is a request to update a number of registered UEs or a number of PDU sessions for the HPLMN mapped network slice; and 
   at the NSACF in the VPLMN of the UE:
 receiving the update request from the network node; 
 obtaining information that indicates a maximum number of registered UEs or PDU sessions for a HPLMN mapped network slice associated to the particular network slice from a network node in the HPLMN of the UE; and 
 applying the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice to process the update request. 
   
     
     
         11 . The method of  claim 10  further comprising, at the network node in the VPLMN of the UE, obtaining subscription data for the UE, the subscription data comprising information that indicates whether Network Slice Admission Control, NSAC, is controlled by the VPLMN or controlled by the HPLMN. 
     
     
         12 . The method of  claim 10  further comprising:
 at the NSACF in the VPLMN of the UE:
 subscribing to changes in slice selection subscription data comprising changes to the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice; and 
 
 at the network node in the HPLMN of the UE:
 responsive to the subscription, notifying the NSACF in the VPLMN of the UE of a change to the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice. 
 
 
     
     
         13 . A method performed by a Network Slice Admission Control Function, NSACF, in a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE, the method comprising:
 receiving an update request from a network node in the VPLMN the UE, the update request being a request to update a number of registered UEs or a number of Protocol Data Unit, PDU, sessions for a particular network slice;   obtaining information that indicates a maximum number of registered UEs or PDU sessions for a HPLMN mapped network slice associated to the particular network slice from a network node in the HPLMN of the UE; and   applying the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice to process the update request.   
     
     
         14 . The method of  claim 13  further comprising:
 subscribing to changes in slice selection subscription data comprising changes to the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice; and 
 responsive to the subscribing, receiving a notification of a change to the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice. 
 
     
     
         15 . A network node that implements a Network Slice Admission Control Function, NSACF, for a Visited Public Land Mobile Network, VPLMN, of a User Equipment, UE, the network node comprising processing circuitry configured to cause the network node to:
 receive an update request from a network node in the VPLMN the UE, the update request being a request to update a number of registered UEs or a number of Protocol Data Unit, PDU, sessions for a particular network slice;   obtain information that indicates a maximum number of registered UEs or PDU sessions for a HPLMN mapped network slice associated to the particular network slice from a network node in the HPLMN of the UE; and   apply the maximum number of registered UEs or PDU sessions for the HPLMN mapped network slice to process the update request.   
     
     
         16 - 44 . (canceled)